Continuity mistake: In the school cloakroom above the coats, is a shelf of dodgeballs, footballs and basketballs. Look at the arrangement of the balls when Miss Kettlewell enters the cloakroom. When Miss Kettlewell is stabbed, and crashes into the desks, you can see in the cloakroom that the arrangement has totally changed and additional items have appeared.
Picture added by Hamster
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